Security constrained optimal power flow method based on power flow transfer relation

A technology with safety constraints and optimal power flow, applied in AC network circuits, AC networks with the same frequency from different sources, circuit devices, etc.

Inactive Publication Date: 2018-05-25
STATE GRID FUJIAN ELECTRIC POWER CO LTD +1
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  • Abstract
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Problems solved by technology

[0003] For large-scale power systems, due to the large scale of expected fault sets, if all expected fault states are modeled in detail and their reliability constraints are considered, the calculation scale of the SCOPF problem will be very large, and its numerical solution will have great difficulties. Practical value
How to improve the efficiency of solving the SCOPF problem is the key to its practicality, and the existing methods cannot perfectly solve this problem
The Benders decomposition method, parallel computing technology and special sparse matrix processing technology have all been studied and used to improve the solution speed of SCOPF problems, but with the expansion of the expected fault set, the difficulty of solving the problem will increase e...

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  • Security constrained optimal power flow method based on power flow transfer relation
  • Security constrained optimal power flow method based on power flow transfer relation
  • Security constrained optimal power flow method based on power flow transfer relation

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Embodiment Construction

[0069] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0070] Regardless of the base state or the fault state, for parallel lines or parallel main transformers, the distribution ratio of active power flow is approximately constant. For parallel lines, the proportion of active power flow distribution of each line is mainly determined by its impedance. If two lines with the same parameters are connected in parallel, the active power flow flowing on each line must be the same. For parallel main variables, take figure 2 The example of two 500kV parallel main transformers is described. Typically, only shunt compensation equipment is connected to the low-voltage side of the main transformer, so the active power flow of the low-voltage winding is always zero. If the loss of the main transformer is neglected, the active power flow of any main transformer high voltage winding is equal to the ac...

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Abstract

The invention discloses a security constrained optimal power flow method based on power flow transfer relation. The method is characterized by establishing active power flow transfer relationship before and after fault based on anticipated fault analysis; describing fault-state branch active power flow into a ground-state branch active power flow function, so that the fault-state branch active power flow constraint is described as ground-state branch active power flow linear inequality constraint; and carrying out grouping on parallel circuits and parallel main transformers, and reducing the scale of monitored branches by utilizing power flow distribution relationship of branches in each group, and carrying out filtering on the fault-state branch active power flow constraint by utilizing the characteristic that short-time flow capacity of a device is obviously larger than long-term flow capacity thereof to minimize the calculation scale of the SCOPF problem as far as possible. The method has a good effect.

Description

technical field [0001] The invention belongs to the field of optimal dispatching of power systems, and relates to a safety-constrained optimal power flow method based on power flow transfer relations. Background technique [0002] Since the real-time automatic processing of power system faults still has great technical difficulties, the focus of safe operation of the power grid is to prevent the consequences of accidents. In order to avoid cascading failures caused by predicted disconnection and allow sufficient time for operators to deal with accidents, it is necessary to properly control the power flow during normal operation of the power grid to ensure that the credible predicted disconnection will not cause the power flow of power equipment to exceed Its short-term allowable carrying capacity. Security Constrained Optimal Power Flow (SCOPF) adds reliability constraints to the optimal power flow model, which can better guarantee the safe and reliable operation of the pow...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 宋少群郭瑞鹏陈峰黄文英赵海青余秀月边麟龙
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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